When concentrated sulphuric acid is added slowly to a solution of ferrous sulphate containing nitrate ion, a brown colour ring is formed. The compositionn of the ring is

Options

A. `[Fe(H_(2)O)_(5)NO]SO_(4)`
B. `FeSO_(4).NO_(2)`
C. `Fe[(H_(2)O)_(5)](NO_(3))_(2)`
D. None of these

Answer

A

Explanation

`NO_(3)^(-)+H_(2)SO_(4)rarrHNO_(3)+HSO_(4)^(-)`
`2HNO_(3)rarrH_(2)O+2NO+3[O]`
`FeSO_(4)+NO+5H_(2)Orarr underset("Brown colour")([Fe(H_(2)O)_(5)NO^(+)])SO_(4)`